/*********************************************************************
 * Copyright (C) 2006 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.common;

public class LengthConverter {
    private static double[][] factors =
            new double[LengthUnit.getCount()][LengthUnit.getCount()];

    static {
        // The identity factors
        factors[LengthUnit.POINTS.getIndex()][LengthUnit.POINTS.getIndex()] = 1;
        factors[LengthUnit.METRES.getIndex()][LengthUnit.METRES.getIndex()] = 1;
        factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 1;
        factors[LengthUnit.INCHES.getIndex()][LengthUnit.INCHES.getIndex()] = 1;

        // The points conversion factors
        factors[LengthUnit.POINTS.getIndex()][LengthUnit.METRES.getIndex()] = 0.00035277777778;
        factors[LengthUnit.POINTS.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 0.035277777778;
        factors[LengthUnit.POINTS.getIndex()][LengthUnit.INCHES.getIndex()] = 0.013888888889;

        // The metres conversion factors
        factors[LengthUnit.METRES.getIndex()][LengthUnit.POINTS.getIndex()] = 2877.84;
        factors[LengthUnit.METRES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 100;
        factors[LengthUnit.METRES.getIndex()][LengthUnit.INCHES.getIndex()] = 39.37;

        // The centimetres conversion factors
        factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.POINTS.getIndex()] = 28.34643;
        factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.METRES.getIndex()] = 0.01;
        factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.INCHES.getIndex()] = 0.3937;

        // The inches conversion factors
        factors[LengthUnit.INCHES.getIndex()][LengthUnit.POINTS.getIndex()] = 72;
        factors[LengthUnit.INCHES.getIndex()][LengthUnit.METRES.getIndex()] = 0.0254;
        factors[LengthUnit.INCHES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 2.54;
    }

    public static double getConversionFactor(LengthUnit from, LengthUnit to) {
        return factors[from.getIndex()][to.getIndex()];
    }
}
